Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Condensed Consolidated Statements of Cash Flows
Net cash provided by operating activities	$ 121,367	$ 85,894
Cash Flows from Investing Activities
Investments purchased	(540,159)	(422,287)
Investments sold	349,411	285,886
Investments called or matured	135,750	77,611
Net change in short-term investments	(43,745)	40,027
Net property and equipment purchased	(6,405)	(5,543)
Investment in equity method investee	(1,711)	(5,301)
Net cash used in investing activities	(106,859)	(29,607)
Cash Flows from Financing Activities
Cash dividends paid	(24,221)	(22,791)
Stock plan share issuance	39	3,672
Excess tax benefit from exercise of stock options	7,242	400
Net cash used in financing activities	(16,940)	(18,719)
Net increase (decrease) in cash	(2,432)	37,568
Cash at the beginning of the period	30,620	39,469
Cash at September 30	$ 28,188	$ 77,037